This is the second most difficult climb in Switzerland and in the World Top 25.
PJAMM will climb and document Rila in June, 2018. We have confirmed with several Strava members who have ridden this climb that it can be done on a road bike:
Giulio Cardano Hello John. I made it by bike. After the top there is less than 1 km of dirt road where you have to be careful but it is more than practicable, as you can see from the photo. At most it takes up an extra air chamber. There are also two galleries completely to the oxen so it is better to have a torch (I did not have it). In my opinion, it is the most beautiful climb in the area and the traffic of cars is almost null since only residents can climb. Good fun !
Mauro Cavalli Hi, yes... all paved (not very well) but you have to go back from the same side, on the other side of the tunnel there are two long gravel pieces
Matthias Eisenring yes, it's paved to the top. but i would recommend a mountain bike, because the road isn't everywhere in a perfect condition. and with the road bike you have to go the same way down.
Steepest Gradients by Distance
Dangerousroads.org notes of this climb:
“Alpe di Cadinello is a high mountain pass at an elevation of 1.828m above the sea level, located in the canton of Ticino in Switzerland. Starting from Roveredo this winding road is totally asphalted, but extremely narrow (totally impassable for 2 cars at the same time), and pretty steep, with sections up to 20%. In many places the road is bordered by a drop of hundreds of meters (many hundreds of feet) unprotected by guardrails. There are some scary parts, especially because its narrowness and drop offs.
The final part of the climb includes a tunnel extremely narrow called Galleria di Cadolcia. It’s a 250m unlit gravel tunnel that was built during the 2nd World War (finished 1941). The view over Bellinzona and as far as Lake Maggiore is superb. After the pass the road continues but on a gravel surface in very poor conditions.” http://www.dangerousroads.org/europe/switzerland/5638-alpe-di-cadinello.html
WARNING - there is a 200m very dark tunnel at mile 9.15/km 14.7